initial import of NetBSD tree

1 files changed, 283 insertions, 0 deletions

diff --git a/include/link.h b/include/link.h
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--- /dev/null
+++ b/include/link.h
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+/*	$NetBSD: link.h,v 1.9 1995/09/23 22:26:15 pk Exp $	*/
+
+/*
+ * Copyright (c) 1993 Paul Kranenburg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by Paul Kranenburg.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * RRS section definitions.
+ *
+ * The layout of some data structures defined in this header file is
+ * such that we can provide compatibility with the SunOS 4.x shared
+ * library scheme.
+ */
+
+#ifndef _LINK_H_
+#define _LINK_H_
+
+/*
+ * A `Shared Object Descriptor' descibes a shared object that is needed
+ * to complete the link edit process of the object containing it.
+ * A list of such objects (chained through `sod_next') is pointed at
+ * by `sdt_sods' in the section_dispatch_table structure.
+ */
+
+struct sod {	/* Shared Object Descriptor */
+	long	sod_name;		/* name (relative to load address) */
+	u_int	sod_library  : 1,	/* Searched for by library rules */
+		sod_reserved : 31;
+	short	sod_major;		/* major version number */
+	short	sod_minor;		/* minor version number */
+	long	sod_next;		/* next sod */
+};
+
+/*
+ * `Shared Object Map's are used by the run-time link editor (ld.so) to
+ * keep track of all shared objects loaded into a process' address space.
+ * These structures are only used at run-time and do not occur within
+ * the text or data segment of an executable or shared library.
+ */
+struct so_map {		/* Shared Object Map */
+	caddr_t		som_addr;	/* Address at which object mapped */
+	char 		*som_path;	/* Path to mmap'ed file */
+	struct so_map	*som_next;	/* Next map in chain */
+	struct sod	*som_sod;	/* Sod responsible for this map */
+	caddr_t		som_sodbase;	/* Base address of this sod */
+	u_int		som_write : 1;	/* Text is currently writable */
+	struct _dynamic	*som_dynamic;	/* _dynamic structure */
+	caddr_t		som_spd;	/* Private data */
+};
+
+/*
+ * Symbol description with size. This is simply an `nlist' with
+ * one field (nz_size) added.
+ * Used to convey size information on items in the data segment
+ * of shared objects. An array of these live in the shared object's
+ * text segment and is addressed by the `sdt_nzlist' field.
+ */
+struct nzlist {
+	struct nlist	nlist;
+	u_long		nz_size;
+#define nz_un		nlist.n_un
+#define nz_strx		nlist.n_un.n_strx
+#define nz_name		nlist.n_un.n_name
+#define nz_type		nlist.n_type
+#define nz_value	nlist.n_value
+#define nz_desc		nlist.n_desc
+#define nz_other	nlist.n_other
+};
+
+#define N_AUX(p)	((p)->n_other & 0xf)
+#define N_BIND(p)	(((unsigned int)(p)->n_other >> 4) & 0xf)
+#define N_OTHER(r, v)	(((unsigned int)(r) << 4) | ((v) & 0xf))
+
+#define AUX_OBJECT	1
+#define AUX_FUNC	2
+/*#define BIND_LOCAL	0	not used */
+/*#define BIND_GLOBAL	1	not used */
+#define BIND_WEAK	2
+
+
+/*
+ * The `section_dispatch_table' structure contains offsets to various data
+ * structures needed to do run-time relocation.
+ */
+struct section_dispatch_table {
+	struct so_map *sdt_loaded;	/* List of loaded objects */
+	long	sdt_sods;		/* List of shared objects descriptors */
+	long	sdt_paths;		/* Library search paths */
+	long	sdt_got;		/* Global offset table */
+	long	sdt_plt;		/* Procedure linkage table */
+	long	sdt_rel;		/* Relocation table */
+	long	sdt_hash;		/* Symbol hash table */
+	long	sdt_nzlist;		/* Symbol table itself */
+	long	sdt_filler2;		/* Unused (was: stab_hash) */
+	long	sdt_buckets;		/* Number of hash buckets */
+	long	sdt_strings;		/* Symbol strings */
+	long	sdt_str_sz;		/* Size of symbol strings */
+	long	sdt_text_sz;		/* Size of text area */
+	long	sdt_plt_sz;		/* Size of procedure linkage table */
+};
+
+/*
+ * RRS symbol hash table, addressed by `sdt_hash' in section_dispatch_table.
+ * Used to quickly lookup symbols of the shared object by hashing
+ * on the symbol's name. `rh_symbolnum' is the index of the symbol
+ * in the shared object's symbol list (`sdt_nzlist'), `rh_next' is
+ * the next symbol in the hash bucket (in case of collisions).
+ */
+struct rrs_hash {
+	int	rh_symbolnum;		/* Symbol number */
+	int	rh_next;		/* Next hash entry */
+};
+
+/*
+ * `rt_symbols' is used to keep track of run-time allocated commons
+ * and data items copied from shared objects.
+ */
+struct rt_symbol {
+	struct nzlist		*rt_sp;		/* The symbol */
+	struct rt_symbol	*rt_next;	/* Next in linear list */
+	struct rt_symbol	*rt_link;	/* Next in bucket */
+	caddr_t			rt_srcaddr;	/* Address of "master" copy */
+	struct so_map		*rt_smp;	/* Originating map */
+};
+
+/*
+ * Debugger interface structure.
+ */
+struct so_debug {
+	int	dd_version;		/* Version # of interface */
+	int	dd_in_debugger;		/* Set when run by debugger */
+	int	dd_sym_loaded;		/* Run-time linking brought more
+					   symbols into scope */
+	char   	 *dd_bpt_addr;		/* Address of rtld-generated bpt */
+	int	dd_bpt_shadow;		/* Original contents of bpt */
+	struct rt_symbol *dd_cc;	/* Allocated commons/copied data */
+};
+
+/*
+ * Entry points into ld.so - user interface to the run-time linker.
+ */
+struct ld_entry {
+	void	*(*dlopen) __P((char *, int));
+	int	(*dlclose) __P((void *));
+	void	*(*dlsym) __P((void *, char *));
+	int	(*dlctl) __P((void *, int, void *));
+	void	(*dlexit) __P((void));
+	void	(*dlrsrvd[3]) __P((void));
+};
+
+/*
+ * This is the structure pointed at by the __DYNAMIC symbol if an
+ * executable requires the attention of the run-time link editor.
+ * __DYNAMIC is given the value zero if no run-time linking needs to
+ * be done (it is always present in shared objects).
+ * The union `d_un' provides for different versions of the dynamic
+ * linking mechanism (switched on by `d_version'). The last version
+ * used by Sun is 3. We leave some room here and go to version number
+ * 8 for NetBSD, the main difference lying in the support for the
+ * `nz_list' type of symbols.
+ */
+
+struct	_dynamic {
+	int		d_version;	/* version # of this interface */
+	struct so_debug	*d_debug;
+	union {
+		struct section_dispatch_table *d_sdt;
+	} d_un;
+	struct ld_entry *d_entry;	/* compat - now in crt_ldso */
+};
+
+#define LD_VERSION_SUN		(3)
+#define LD_VERSION_BSD		(8)
+#define LD_VERSION_NZLIST_P(v)	((v) >= 8)
+
+#define LD_GOT(x)	((x)->d_un.d_sdt->sdt_got)
+#define LD_PLT(x)	((x)->d_un.d_sdt->sdt_plt)
+#define LD_REL(x)	((x)->d_un.d_sdt->sdt_rel)
+#define LD_SYMBOL(x)	((x)->d_un.d_sdt->sdt_nzlist)
+#define LD_HASH(x)	((x)->d_un.d_sdt->sdt_hash)
+#define LD_STRINGS(x)	((x)->d_un.d_sdt->sdt_strings)
+#define LD_NEED(x)	((x)->d_un.d_sdt->sdt_sods)
+#define LD_BUCKETS(x)	((x)->d_un.d_sdt->sdt_buckets)
+#define LD_PATHS(x)	((x)->d_un.d_sdt->sdt_paths)
+
+#define LD_GOTSZ(x)	((x)->d_un.d_sdt->sdt_plt - (x)->d_un.d_sdt->sdt_got)
+#define LD_RELSZ(x)	((x)->d_un.d_sdt->sdt_hash - (x)->d_un.d_sdt->sdt_rel)
+#define LD_HASHSZ(x)	((x)->d_un.d_sdt->sdt_nzlist - (x)->d_un.d_sdt->sdt_hash)
+#define LD_STABSZ(x)	((x)->d_un.d_sdt->sdt_strings - (x)->d_un.d_sdt->sdt_nzlist)
+#define LD_PLTSZ(x)	((x)->d_un.d_sdt->sdt_plt_sz)
+#define LD_STRSZ(x)	((x)->d_un.d_sdt->sdt_str_sz)
+#define LD_TEXTSZ(x)	((x)->d_un.d_sdt->sdt_text_sz)
+
+/*
+ * Interface to ld.so
+ */
+struct crt_ldso {
+	int		crt_ba;		/* Base address of ld.so */
+	int		crt_dzfd;	/* "/dev/zero" file decriptor (SunOS) */
+	int		crt_ldfd;	/* ld.so file descriptor */
+	struct _dynamic	*crt_dp;	/* Main's __DYNAMIC */
+	char		**crt_ep;	/* environment strings */
+	caddr_t		crt_bp;		/* Breakpoint if run from debugger */
+	char		*crt_prog;	/* Program name (v3) */
+	char		*crt_ldso;	/* Link editor name (v4) */
+	struct ld_entry	*crt_ldentry;	/* dl*() access (v4) */
+};
+
+/*
+ * Version passed from crt0 to ld.so (1st argument to _rtld()).
+ */
+#define CRT_VERSION_SUN		1
+#define CRT_VERSION_BSD_2	2
+#define CRT_VERSION_BSD_3	3
+#define CRT_VERSION_BSD_4	4
+
+
+/*
+ * Maximum number of recognized shared object version numbers.
+ */
+#define MAXDEWEY	8
+
+/*
+ * Header of the hints file.
+ */
+struct hints_header {
+	long		hh_magic;
+#define HH_MAGIC	011421044151
+	long		hh_version;	/* Interface version number */
+#define LD_HINTS_VERSION_1	1
+	long		hh_hashtab;	/* Location of hash table */
+	long		hh_nbucket;	/* Number of buckets in hashtab */
+	long		hh_strtab;	/* Location of strings */
+	long		hh_strtab_sz;	/* Size of strings */
+	long		hh_ehints;	/* End of hints (max offset in file) */
+};
+
+#define HH_BADMAG(hdr)	((hdr).hh_magic != HH_MAGIC)
+
+/*
+ * Hash table element in hints file.
+ */
+struct hints_bucket {
+	/* namex and pathx are indices into the string table */
+	int		hi_namex;		/* Library name */
+	int		hi_pathx;		/* Full path */
+	int		hi_dewey[MAXDEWEY];	/* The versions */
+	int		hi_ndewey;		/* Number of version numbers */
+#define hi_major hi_dewey[0]
+#define hi_minor hi_dewey[1]
+	int		hi_next;		/* Next in this bucket */
+};
+
+#define _PATH_LD_HINTS		"/var/run/ld.so.hints"
+
+#endif /* _LINK_H_ */
+